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cos(π/n)cos(2π/n)cos(3π/n) ... cos(nπ/n) = ?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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近似值：有效數字
四邊形的特性
兩位數加法
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
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